Recording-horn



B. R. sEABRook.

RECORDING HORN.

APfLlcArxoN FILED MAY 2.1919.

Patented Nov. 16, 1920.

Unirse stares earsn'r oreice..

BAGSTER ROADS sEABnooK, oF WINNIPEG, MANITOBA, CANADA, SSIGNOR To'MELVYILLE W. MIX, or MISHAWAKA, INDIANA.

nECormING-HORN.

YSpecification of Letters Patent. y Pfened Nov' 16 1920 Applicationfiled May 2. 1919. Serial N0. 294,293.

To (LIZ whom it 11mg/ concern lie it known that I, BAos'inn ROADS Si-:A-

iiuooii, of the city of Winnipeg, in the Prov ince of Uanitoba, Canada,have invented ccrtain new and useful Improvements in Recording-Horns, ofwhich the following is the specification. The invention relates toimprovements in recording: horns particularly as used when makingtalking machine records and the zgeneral object of the invention is toprovide an improved type. of horn which Willle (telve the sound wavesand deliver the sound iii a full, clear` pure and natural manner andwithout inuiiling or chokin, r the same.

A i'urther object or' my invention is to provide a recording horn which`for mechanical reasons may be formed with layers of different materials,but I do not limit inyself to anyspeciiic order or number of such layersas the important results secured by my invention do not dependspecifically on these features but broadly on the use of an inertcomposition which forms the wall of the' horn, of varying thickness,being thinnest at the deliv ry end and thickest at the receiving end. Inthis way there is secured a faithfulness of recording that is not otherwise attainable.

Wit-li the above more important objects in View the invention consistsessentially in the arrangement and construction of parts hereinaftermore particularly described and later pointed out in the appendedclaims, referencel beingF had to the accompanyiner drawing in whichFigure l represents a longitudinal sectional View centrally through myrecording horn.

Fig. 2 represents an enlarged partial sectional view through the horn,the section being taken at X-X Figi". 1. a'

Fig. 3 represents an enlarged partial s ec- `tional View through thchorn, the section being taken at Y-Y Fie'. 1.

In the drawing like, characters oi rei'erence indicate correspondingparts in the several' figures.

The horn indicated generally by the ret'- erence numeral l comprises aflaring body pari; 2 and n Out-let tubo IS continuons with theI bodypart and which may be axially. alined therewith. 4 represents iie.receiving' end of the horn and 5 the deli .ry end` v By observation itwill be seen that the wall of the horn is comparatively thick atvthereceiving end and tapers gradually o considerably decreased thickness atthe delivery end and the wall of the tube may be of constant thicknessand continuous with the body of the horn. l l i .\s instanced herein,the horn may be formed 0f a supporting shell 6 of paper or other porousmaterial on which is placed a non-absorbent and non-responsivecomposition 9, 11 and 13 whose mass is disposed in reversenianner tothat 'foundin certain reproducing horns which are made vthe sul ject ofseparate applications, Serial Number 240,475 of June 17, 1918 and SerialNumber 255,799 of September 26, 1918.

In adapting thejexemplitication herein shown I may first shape the paperlike Shell 6 to the desired form and then impregnato it with a selfsetting solution to fill the pores so that on hardening the. shellbecomes quite stili'. Thereafter I may apply layers of fabric 7 and 8.The fabric is moistened by any suitable adhesive which upon dryingcauses the fabric t0 snrinlr and become securely adherent to the shell,thus forming n medium on which the composition is a plied. Another layerof fabric l@ may e. placed inside ol the ontereoniposition forstrengthening purposes if the saine shouldbe required for any specialreasons.

If desired a iinai finishin coatin lot varnish 1L may be applied onttaire ontsi e of the horn. Under certain conditions I may also placesome of the composition on the interior ot' the shell o, as at lil, andin addition may also apply a coat of varnish le on the inside, butneither the insid`e"'"tside coatings of varnish, sheilac or other mediumis basically necessary, in sofar as true tone transference is concerned.This letter charH acteristirr. in its broadest aspect depends on theincrease of mass of noirabsorbeni, and non-vibrant composition whereverthe me- -chanical structure ot the horn would make thel receiving end 4where the initial impact oi' the sound waves per unit area is greaterthan at the delivery end 5 l am enabled to build up a horn which lendsitseltI to more truthful recording than is possible when horns arecinadeot' nml-vibratory material only without disposing the mass of materialin relation to the energy factor o the sounds that are to be recorded.

The mass of inert composition which is gradually reduced in thicknessfrom end to end of the horn produces a certain intensity of record'which may be modified by varying the gradation of the mass from auniform thickness ot' wall to a variable. reduction according to thepractical demands of different subjects. As already stated the use ofvarious layers of fabric and the coatings ot' varnish are quiteimmaterial because the invention in its broadest phase resides in aselective disposition of the mass ol' self-setting and self-hardeningcomposition of which the entire horn may be formed without anyextraneous supporting material, the shell (3. whatever. ln such an eventdependence can be placed on the rigidity of the composition alone towithstand the usual mechanical stresses to which horns of this type maysubjected.

What I claim as my invention is l. ln recording horns l'or sounds, ctc.,a flaring body having openings at opposite ends ol different sizes, thethickness of the wall at the larger opening being greater than at thesmaller end.

2. A recording horn having a tapering body whose wall is thick at thelarge endy and relatively thin ai. the small end.

Ii. A recording horn formed of an inert non-absorlwnt and non-resonantcomposition large and thick at one end and small and thinner at theother end.

l. A conical shaped recording horn having tapering variable thicknesswalls that are thickest at. the large end and thinner at the small end.

In recording horns7 a tapering body ot non-absorbent and non-vibrantcomposition whose inside and outside surfaces are i'orined at divergentangles with respect to each other so as to converge toward the smallerend of the. horn. wilg-ned at ll'innepeg, this 26 day of April,

BAGSTER ROADS SEABROOK.

In presence of- S. Roxnaoir, K. B. lVAKErIELD.

